/Engine/Source/Developer/MeshUtilities/Public/MeshUtilities.h
Builds a static mesh using the provided source models and the LOD groups settings, and replaces the RawMeshes with the reduced meshes. Does not modify renderable data.
true if the meshes were built successfully.
bool GenerateStaticMeshLODs ( [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * StaticMesh, const class [FStaticMeshLODGroup](API\Runtime\Engine\FStaticMeshLODGroup) & LODGroup )